# Math Question

#### Bman

##### OSNN Veteran Original
How would you solve this?

Solve each linear system.

a) x + y = -8
x - 2y = 7

#### Heeter

##### Overclocked Like A Mother
Can You tell that it's been 17 years since I last left school.

Heeter

#### Krux

##### Nissan Powered
why type of math is this? and are u trying to find what x= or what?

#### Geffy

##### Moderator
if both of those are in the same part of the question ie both as a) then I would say that you do it by simultaneous equations

x + y = -8 --> leave
x - 2y = 7 --> multiply by -1

x + y = -8
-x + 2y = -7

3y = -15 --> y = -5

x + -5 = 8 --> x = -3
x - 2(-5) = 7 --> x = -3

x = -3
y = -5

both equations work, so yeah I think this is the right way to do it

#### Geffy

##### Moderator
Originally posted by Heeter
Can You tell that it's been 17 years since I last left school.

Heeter
Since you last left school?? Why did you go back?

#### dave holbon

##### Moderator
This is not a linear system/equation.

#### Evil Marge

##### I Rule
Political User
Originally posted by Heeter
Can You tell that it's been 17 years since I last left school.

Heeter
18 year for me.....That's a long long time ago

#### the_music_man

##### aka prodj88 =P
to get that answer you use system of equations. which means multiplying by a certain number to get something in common so they cancel out!

#### Friend of Bill

##### What, me worry?
I always left math problems to the math teacher...

#### Geffy

##### Moderator
Originally posted by almostfamous88
to get that answer you use system of equations. which means multiplying by a certain number to get something in common so they cancel out!
look at my post above, thats what I did

#### dave holbon

##### Moderator
So + two apples and a banana still equals an orange –two apples and a banana then?

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